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SEGMENT REPORTING (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended | 36 Months Ended
--- | --- | --- | ---
Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Jun. 30, 2010 | Mar. 31, 2010 | Dec. 31, 2011 reportable_segments | Dec. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2011
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of Reportable Segments |  |  |  |  |  |  |  |  | 5 |  |  |
Revenues | $ 38,213 | $ 36,656 | $ 37,845 | $ 37,447 | $ 36,044 | $ 36,302 | $ 33,997 | $ 34,702 | $ 150,161 | $ 141,045 | $ 134,445 |
Property operating expenses and real estate taxes |  |  |  |  |  |  |  |  | 48,057 | 46,478 | 43,991 |
Reserve for notes receivable |  |  |  |  |  |  |  |  | 0 | 0 | 1,734 |
Abandonment of project costs |  |  |  |  |  |  |  |  | 0 | 0 | 2,487 |
General and administrative expenses |  |  |  |  |  |  |  |  | 23,086 | 20,220 | 22,006 |
Income before depreciation and amortization |  |  |  |  |  |  |  |  | 79,018 | 74,347 | 64,227 |
Depreciation and amortization |  |  |  |  |  |  |  |  | (32,986) | (28,808) | (27,612) |
Interest and other finance expense |  |  |  |  |  |  |  |  | (37,109) | (40,498) | (35,632) |
Real estate at cost | 1,471,745 |  |  |  | 1,305,561 |  |  |  | 1,471,745 | 1,305,561 | 1,119,758 | 1,471,745
Total assets | 1,653,319 |  |  |  | 1,524,806 |  |  |  | 1,653,319 | 1,524,806 | 1,382,464 | 1,653,319
Expenditures for real estate and improvements |  |  |  |  |  |  |  |  | 181,498 | 80,520 | 127,322 |
Other interest income |  |  |  |  |  |  |  |  | 276 | 408 | 642 |
Equity in earnings (losses) of unconsolidated affiliates |  |  |  |  |  |  |  |  | 1,555 | 10,971 | (1,529) |
Impairment of investment in unconsolidated affiliate |  |  |  |  |  |  |  |  | 0 | 0 | (3,768) |
Gain on debt extinguishment |  |  |  |  |  |  |  |  | 1,268 | 0 | 7,057 |
Income tax provision |  |  |  |  |  |  |  |  | 474 | 2,890 | 1,541 |
Gain from bargain purchase |  |  |  |  |  |  |  |  | 0 | 33,805 | 0 |
Impairment of asset |  |  |  |  |  |  |  |  | (6,925) | 0 | 0 |
Gain on sale of property |  |  |  |  |  |  |  |  | 46,830 | 0 | 7,143 | 53,973
Income from discontinued operations |  |  |  |  |  |  |  |  | 2,262 | 3,332 | 3,719 |
Net income |  |  |  |  |  |  |  |  | 53,715 | 50,667 | 12,706 |
Net (income) loss attributable to noncontrolling interests |  |  |  |  |  |  |  |  | (2,160) | (20,610) | 18,427 |
Net income attributable to Common Shareholders | 7,887 | 4,011 | 30,234 | 9,423 | 7,012 | 5,117 | 12,798 | 5,130 | 51,555 | 30,057 | 31,133 |
Core Portfolio [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 57,994 | 57,084 | 64,249 |
Property operating expenses and real estate taxes |  |  |  |  |  |  |  |  | 17,087 | 17,236 | 19,282 |
Reserve for notes receivable |  |  |  |  |  |  |  |  |  |  | 0 |
Abandonment of project costs |  |  |  |  |  |  |  |  |  |  | 12 |
General and administrative expenses |  |  |  |  |  |  |  |  | 24,226 | 22,439 | 23,983 |
Income before depreciation and amortization |  |  |  |  |  |  |  |  | 16,681 | 17,409 | 20,972 |
Depreciation and amortization |  |  |  |  |  |  |  |  | (14,206) | (13,798) | (14,595) |
Interest and other finance expense |  |  |  |  |  |  |  |  | (15,967) | (18,036) | (19,539) |
Real estate at cost | 499,872 |  |  |  | 441,714 |  |  |  | 499,872 | 441,714 | 436,071 | 499,872
Total assets | 633,345 |  |  |  | 574,497 |  |  |  | 633,345 | 574,497 | 558,240 | 633,345
Expenditures for real estate and improvements |  |  |  |  |  |  |  |  | 72,571 | 4,137 | 3,161 |
Opportunity Funds [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 55,888 | 42,062 | 37,375 |
Property operating expenses and real estate taxes |  |  |  |  |  |  |  |  | 18,952 | 17,671 | 14,874 |
Reserve for notes receivable |  |  |  |  |  |  |  |  |  |  | 0 |
Abandonment of project costs |  |  |  |  |  |  |  |  |  |  | 2,475 |
General and administrative expenses |  |  |  |  |  |  |  |  | 16,678 | 13,588 | 13,593 |
Income before depreciation and amortization |  |  |  |  |  |  |  |  | 20,258 | 10,803 | 6,433 |
Depreciation and amortization |  |  |  |  |  |  |  |  | (15,454) | (10,898) | (10,480) |
Interest and other finance expense |  |  |  |  |  |  |  |  | (16,546) | (18,244) | (10,657) |
Real estate at cost | 773,562 |  |  |  | 667,179 |  |  |  | 773,562 | 667,179 | 486,032 | 773,562
Total assets | 901,758 |  |  |  | 772,715 |  |  |  | 901,758 | 772,715 | 607,706 | 901,758
Expenditures for real estate and improvements |  |  |  |  |  |  |  |  | 107,231 | 77,309 | 116,734 |
Self Storage Investments [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 23,189 | 21,314 | 11,166 |
Property operating expenses and real estate taxes |  |  |  |  |  |  |  |  | 14,435 | 13,107 | 10,985 |
Reserve for notes receivable |  |  |  |  |  |  |  |  |  |  | 0 |
Abandonment of project costs |  |  |  |  |  |  |  |  |  |  | 0 |
General and administrative expenses |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Income before depreciation and amortization |  |  |  |  |  |  |  |  | 8,754 | 8,207 | 181 |
Depreciation and amortization |  |  |  |  |  |  |  |  | (4,221) | (4,552) | (3,762) |
Interest and other finance expense |  |  |  |  |  |  |  |  | (3,603) | (4,660) | (5,681) |
Real estate at cost | 213,743 |  |  |  | 210,017 |  |  |  | 213,743 | 210,017 | 208,702 | 213,743
Total assets | 192,154 |  |  |  | 194,003 |  |  |  | 192,154 | 194,003 | 196,658 | 192,154
Expenditures for real estate and improvements |  |  |  |  |  |  |  |  | 3,779 | 1,376 | 10,996 |
Notes Receivable [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 11,429 | 19,161 | 19,698 |
Property operating expenses and real estate taxes |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Reserve for notes receivable |  |  |  |  |  |  |  |  |  |  | 1,734 |
Abandonment of project costs |  |  |  |  |  |  |  |  |  |  | 0 |
General and administrative expenses |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Income before depreciation and amortization |  |  |  |  |  |  |  |  | 11,429 | 19,161 | 17,964 |
Depreciation and amortization |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Interest and other finance expense |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Real estate at cost | 0 |  |  |  | 0 |  |  |  | 0 | 0 | 0 | 0
Total assets | 59,989 |  |  |  | 89,202 |  |  |  | 59,989 | 89,202 | 125,221 | 59,989
Expenditures for real estate and improvements |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Other [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 25,782 | 22,479 | 23,265 |
Property operating expenses and real estate taxes |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Reserve for notes receivable |  |  |  |  |  |  |  |  |  |  | 0 |
Abandonment of project costs |  |  |  |  |  |  |  |  |  |  | 0 |
General and administrative expenses |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Income before depreciation and amortization |  |  |  |  |  |  |  |  | 25,782 | 22,479 | 23,265 |
Depreciation and amortization |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Interest and other finance expense |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Real estate at cost | 0 |  |  |  | 0 |  |  |  | 0 | 0 | 0 | 0
Total assets | 0 |  |  |  | 0 |  |  |  | 0 | 0 | 0 | 0
Expenditures for real estate and improvements |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Amounts Eliminated in Consolidation [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | (24,121) | (21,055) | (21,308) |
Property operating expenses and real estate taxes |  |  |  |  |  |  |  |  | (2,417) | (1,536) | (1,150) |
Reserve for notes receivable |  |  |  |  |  |  |  |  |  |  | 0 |
Abandonment of project costs |  |  |  |  |  |  |  |  |  |  | 0 |
General and administrative expenses |  |  |  |  |  |  |  |  | (17,818) | (15,807) | (15,570) |
Income before depreciation and amortization |  |  |  |  |  |  |  |  | (3,886) | (3,712) | (4,588) |
Depreciation and amortization |  |  |  |  |  |  |  |  | 895 | 440 | 1,225 |
Interest and other finance expense |  |  |  |  |  |  |  |  | (993) | 442 | 245 |
Real estate at cost | (15,432) |  |  |  | (13,349) |  |  |  | (15,432) | (13,349) | (11,047) | (15,432)
Total assets | (133,927) |  |  |  | (105,611) |  |  |  | (133,927) | (105,611) | (105,361) | (133,927)
Expenditures for real estate and improvements |  |  |  |  |  |  |  |  | $ (2,083) | $ (2,302) | $ (3,569) |

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